Hirschsprung DiseaseDuodenoscopyCrohn DiseaseProto-Oncogene Proteins c-retEnteric Nervous SystemSOXE Transcription FactorsInflammatory Bowel DiseasesGlial Cell Line-Derived Neurotrophic Factor ReceptorsReceptor, Endothelin BEndothelin-3Waardenburg SyndromeReceptor Protein-Tyrosine KinasesIrritable Bowel SyndromeMicrocephalyGlial Cell Line-Derived Neurotrophic FactorNeural CrestMultiple Endocrine Neoplasia Type 2aMutationFaciesPenetranceReceptors, EndothelinRectumCarcinoma, MedullaryHigh Mobility Group ProteinsConsanguinityShort Bowel SyndromeIntellectual DisabilityDrosophila ProteinsAbnormalities, MultipleProto-Oncogene ProteinsHaplotypesSyndromeGerm-Line MutationNerve Growth FactorsPedigreeColitis, UlcerativePolymorphism, Single-Stranded Conformational